diff --git a/src/diffpy/__init__.py b/src/diffpy/__init__.py
index 04d8ace..4b8451c 100644
--- a/src/diffpy/__init__.py
+++ b/src/diffpy/__init__.py
@@ -14,3 +14,6 @@
 # See LICENSE.rst for license information.
 #
 ##############################################################################
+from pkgutil import extend_path
+
+__path__ = extend_path(__path__, __name__)